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5 t ion,however,"a's the purposeof the'invention ean be carried out with the specified ingredi- [UN TED STATES PATENT OFFICE.

HENRY G. PIFFARD, OENEW YORK, .N. Y.

"YIFIPHOTOGENIC POWDER.

- 'srnclrronu'zon d r n part of Letters pat nrrio. 384,927, dated June 19. 1888.

Appli'cr Lgop filed January 2l, i888. ScrialNo. 261,523. (No specimens ,To all whom z't-may concern..-

Be it known. that I, HENRY G. PIFFARD, a citizen of: the United States, and a resident of New York, in the county of New York and State of New York, have inven'teda certain new and useful Improved Photogenic Powder,

of which the following is a specification Thenbiectei my invcntionis'io produce a cheap,,safe, and effective photogenic powder, suitable for use in producing light for photographic and other purposes.

My invention consists in a powder composedof an intimate mixture of magnesium powder and wood powder, or any similar nitro li'gnin equivalent, consisting of nitrated wood fiber or nitrocellulose compound, prepared after themanner described in the reis- .sue patent of Dittmar, No. 6,645, or in any other suitable manner.

In carrying out my invention I ordinarily prefer to use two parts, by weight, of magnefliuni powder with-one part of the easily-igniti-- 'ble powder, as specified, the mixture of the two powders being produced in any desired way. I do not confine myseif to thisproporv exits mixedin relative proportions different from those above mentioned. It is essential, however, that the wood powder or equivalent 30 should be in sufficient proportion to produce" combustion of the magnesium.

My improved powder may housed by placing a small 'quaniity'loosely on an incombus 'tiblesupport and applying-a lighted match, 5

taper. fuse, or other source of heat suifieient to inflame the wood powder or specified equivalent. The ignition oi the wood powderor equivalent excites rapid combustion .of, magnesium with the production ofa brilliantlight o of momentary duration.

What I claim'as my invention is Asa new article of manufacture, an improved photogenic powder consisting of magnesium powder intimately mixed with wood is powder or anysimilar nitro-lignin equivalent, subslantially as and for the purpose specified.

Signed at New York. in the county of New York and State of New York, this 18th day of Januar A. D. 1.888.

" HENRY G. PIFFARD.

Witnesses:

WM. H. CAPEL, HUeo KOELK ER. 

